(p,ρ,T) properties of seawater: Extensions to high salinities

摘要

Measurements of (p,ρ,T) properties of seawater with absolute salinity S A=(31.684, 33.507, 37.372, 37.969, 40.164, 41.825, 44.811, 46.119, 48.600, 50.232, 52.449 and 55.529)gkg -1, temperature T=273.15-468.15K and pressures, p, up to 140MPa are reported with the reproducibility of the density measurements observed to be in the average percent deviation range Δρ/ρ=±0.01-0.03. The measurements are made with a new set up vibration-tube densimeter which is calibrated using double-distilled water (Wagner and Pruß, 2002), methanol [(de Reuck and Craven, 1993), (Osada et al., 1999) and (Yokoyama and Uematsu, 2003)] and aqueous NaCl solutions [(Archer, 1992) and (Hilbert, 1979)]. Based on these measurements, an empirical expression for the density of seawater at high salinities has been developed as a function of salinity, pressure and temperature. The results can be used to extend the present equation of state of seawater to higher temperatures for pressure up to 140MPa.

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